cluster “lifetime” cluster “lifetime” projects: lifecon (coordinator vtt, finland)...
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Cluster “LIFETIME”
Cluster “LIFETIME” projects:
• LIFECON (Coordinator VTT, Finland)• EUROLIFEFORM (Coordinator Taylor Woodrow, United Kingdom)• INVESTIMMO (Coordinator CSTB, France)• LICYMIN (Coordinator ICSTM, United Kingdom)• CONLIFE (Coordinator Universität Essen, Germany)
Cluster “LIFETIME” coordinating organisations:
• VTT Technical Research Centre of Finland, FI (coordinator of the cluster: Prof. Dr. Asko Sarja, [email protected])• Taylor Woodrow Construction Ltd, UK• CSTB Centre Scientifique et Technique du Bâtiment, FR• Imperial College of Science, Technology and Medicine, UK• Universität Essen, DE
Cluster “LIFETIME” consists of five EU Growth programme projects, with objective to integrate the knowledge of partners of these projects for advancing the work and results of all projects, and to produce an
integrated and generic “European Guide for Lifetime Design and Management of Civil Infrastructures and Buildings”
Project: C O N L I F ECoordinator: Universität Essen, IBPM, Germany. Prof. Dr. Max J. Setzer, [email protected]
Life-time prediction of high-performance concrete with respect to durability
Major Objective: Development of deterioration models and life-time design concepts for high-performance concrete (HPC) under different environmental conditions and exposure classes
Publications: (1) M.J. Setzer, S. Palecki: Proceedings of international conference on durability of HPC and final workshop of CONLIFE, 23-24 September 2004, Essen, Germany, ISBN 3 931 681 807 (2) CONLIFE Manual with recommendations for application of HPC & database as CD-rom, published and distributed by MC Bauchemie, September 2004 (3) CONLIFE web page: http:/fasae.ibpmw.uni-essen.de/euproject , deliverable reports 1-10
Freeze-thaw
Frost-salt
Cyclic temperature
Acid
Seawater
Shrinkage
Fire
(A) Mix design/ composition
(B) Production
(C) Fresh concreteproperties
(D) Hardened concrete properties
Rheology, workability, etc.
Strength, pore size distr.,etc.
Durability
Des
crip
tio
n o
f d
eter
iora
tio
n p
roce
ss a
nd
d
efin
itio
n o
f re
com
men
dat
ion
s fo
r ap
pli
cati
on
Applied test procedure
Per
form
ance
of
HP
C u
nd
er d
iffe
ren
t ex
po
sure
co
nd
itio
ns
(D)
Exposure classes (EN206)
Implementation of test procedure
Amendments of test method for HPC
Lab performance
Field performance
Review of in-service structure
General assessment and recommendations for mix designs
Service-life evaluation
↑ Comparison of laboratory and field exposure in Finnish -40C environment, for an HPC mixture with a w/b=0.42, 7% silica fume and non-air entrained
0.0
0.1
0.2
0.3
0.30 0.35 0.42 0.50water/binder ratio
Sh
rinka
ge
[mm
/m]
Drying
Autogenous
OPC
e.g. shrinkage
← Effect of w/b ratio on drying and autogenous shrinkage, for HPC and OPC (w/b=0.50).
21
6menv,
pc
b
x D
a
K
fxt
e.g.
seawater
0,125 mm e.g. frost-salt
Exposed aggregate from severe scaling of surface paste layer ↓
Main output: Manual with recommendations and hints regarding HPC application and service-life estimation, including acceptance criteria and production rules(2) (Fig.2)
20
40
60
80
100
0 20 40 60 80 100Lab test duration [ftc]
RD
M [%
]
laboratory resistance
field resistance
critical
1st Winter 2nd Winter
Accelerated lab testingsimulation of attack type standardized by test methods, testing of 66 mixes
Field testing of 22 mixes per region at totally 9 teststations all over Europe, coveringdifferent climatic conditions
Analysis of in-service structures app. 60 existing structures with
differences of climate, application type and mix design
Work program:
Results:• Understanding and avoidance of damages of
HPC due to practical conditions • Know-how about optimal composition of HPC mix designs with regard
to rheological aspects and damage protection • Adjustment of existing test methods to the behaviour of HPC• Estimation of a service-life of HPC constructions under various climates• Achievement of a fundamental database and an unified European level
Investigation of all relevant HPCproperties with identification of damage mechanisms, service-life estimation and final definition of hints (Fig.1)
e.g. frost
Fig.2: Overview of manual structure, divided into the above sub-chapters for each of the investigated exposure type - example of results(1),(2),(3)
Fig.1: Summary of work program
t: period of corrosion initiation in year,xc: cover thickness in mm,
a, b: regression constants, a = 0.212 and b = 1.53,D6m: the diffusivity measured at 6 months age by the CTH method
fp: factor describing effect of pozzolanic additives on chloride threshold
Kx,env: environmental factor.
Prediction of corrosion initiation periodwhere:
Variation of additives +admixtures, cement, air
Mixing order, SP dosage,etc.Lab testingby appropriate test methods
Mix
des
ign
an
d p
rod
uct
ion
ru
les
(A),
(B
)
Pro
per
ties
of
HP
C (
C),
(D
)
Inpu
t of
dat
a in
to d
atab
ase